SDS250R Lecture Notes - Lecture 2: Cumulative Frequency Analysis, Percentile
14 Sep 2016
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Sds 250r - lecture 2 - frequency distributions. Frequency: # of times scores occur relative frequency = rel. f cumulative frequency = cf. Sample size: # of scores obtained (n) Bar graph: for discrete variables, bars not touching to represent that values don"t overlap. Histogram: for continuous variables, bars do touch. Polygon: for continuous variables, but too many scores on x-axis. Formula for relative frequency: rel. f = f/n. Frequency of all scores at and below particular score. How to get cf: add that score"s frequency with frequencies for all scores below it. % of all scores in a data that are at or below a particular score. Scores combined to form small groups then report total f / rel. f / cf of each group. Apparent limits = group boundaries we see ex; distance people live form the university, can be grouped as 0-1km, 2-3km, etc.
